Method of operating a vertical venetian blind



Feb. 6, 1968 A. J. ToTl 3,367,390

METHOD OF OPERATING A VERTICAL VENETIAN BLIND Filed Aug. 13, 1965 6Sheets-Sheet l mj-ww-M WW Y, w-vL-ww F1a- 6 www 7 'f7 /3/ 74/ /1/ 74,/

IN VEN TOR. ANppw 751-/ ArroP/v/ Feb- 6, 1968 A. 1. TOTI 3,367,390

METHOD OF OPERATING A VERTICAL VENETIAN BLIND Filed Aug. l5, 1965 6Sheets-Sheet :I1v

,4free/vir Feb. 6, 1968 A. J. ToTl METHOD OF OPERATING A VERTICALVENETIAN BLIND 6 Sheets-Sheet 5 Filed Aug. l5, 1965 INVENTOR AWD/Psw J.'Torf A. J. ToTl 3,367,390

METHOD OF OPERATING A VERTICAL VENETIAN BLIND Feb. 6, 1968 Filed Aug.15, 1965 6 Sheets-Sheet 4 INVENTOR. 'A/Dia/ J 707'/ Feb. 6, 1968 A. J.ToTl 3,367,390

METHOD OF OPERATING A VERTICAL VENETIAN BLIND Filed Aug. 13, 1965 6Sheets-Sheet .5

A. J. ToTl 3,367,390

METHOD OF OPERATING A VERTICAL VENETIAN BLIND Feb. 6, 1968 6 Shets-Sheet6 Filed Aug. 15, 1965 INVENTOR ND/Qia/ J 757'/ rToP/vir/ United StatesPatent 3,367,390 METHGD 0F OPERATING A VERTICAL VENETIAN BLIND Andrew I.Toti, 311 W. River Road, Modesto, Calif. 95351 Filed Aug. 13, 1965, Ser.No. 479,531 Claims. (Cl. 16u- 174) This invention relates to a Venetianblind construction in which the blind slats are vertically arranged.More particularly, this invention relates to a traverse type verticalVenetian blind construction to be mounted in a window or like opening ina building for traverse movement therein between a -folded or ret-ractedposition, in which the blind slats are gathered together in a compactpack so that the window or like opening is unobstructed thereby, and anextended position, in which the .slats are unfolded and extend acrossthe window or like opening.

Still more particularly, this invention relates to traverse typevertical Venetian blind in which the blind slats, when in an extendedposition, are located in a preselected angular orientation relative to areference axis or plane, which orientation is selected at the time the.slats are in a retracted position. The Venetian blind of this inventionincludes as an important part thereof simple means for automatically anduniformly positioning the respective slats in a preselected one ofseveral predetermined angular orientations when said slats are traversedfrom a retracted position toward an extended position.

In this regard, the series of .slats which make up the blind of thisinvention are responsive to the angular orientation imparted to a firstslat of the series when the slat series is in the retracted position.That is, the orientation of the first slat of the series determines themanner in which the slat positioning means of the blind actuates theother slats of the series and the angular orientation imparted theretowhen the slats are traversed to an extended position. In thisconnection, this invention further relates to a method of traversing aseries of slats of a vertical Venetian blind by actuating a first slatof the series and thereby automatically positioning the other slats in apreselected angular orientation corresponding to the angular orientationimparted to the rst slat when the slat series is in a retractedposition.

The present invention may be embodied in a traverse type verticalVenetian blind employing only one series of slats, o-r more than oneseries of slats, positionable adjacent the side frame members of thecasing of a window or like building opening when retracted, or extendedacross .such opening between the frame members thereof. Whilehereinafter reference is directed primarily to a blind which includes asingle slat series traversable from one side frame member of a casingtoward the other, this invention is equally well suited for use inconjunction with a blind in which two separate slat series areextensible towards each other from opposite side frame members of such acasing.

Contrary to the constructions employed with many presently availabletypes of vertical blinds, the subject blind does not require or employ abottom guide track member for the lower extremities of the individualslats. Such bottom guide tracks are generally undesirable because of theunattractive appearance presented thereby, particularly when the blindis in the retracted position, and because of the cleanliness problempresented thereby in that accumulation of dust and dirt in and aroundsuch a track is difficult to prevent even by the most fastidioushousekeeper or janitor. Heretofore such bottom tracks were widelyemployed to impart .stability and resistance to sway to vertical blindswhen extended. With the subject invention, slat stability is provided bythe positioning means described in detail hereinafter.

ICC

Furthermore, contrary to the constructions employed with many presentlyavailable types of vertical blinds, the subject blind does not employcomplicated overhead traverse cord and .slat rotating mechanisms. Suchmechanisms are unnecessary in the subject blind because traversemovement and slat orientation is effected upon actuation of the slatpositioning means hereof by the first slat of the series in apredetermined manner. The slat positioning means limits to apredetermined number the various angular orientations in which therespective slats may be located when extended, and insures that apreselected angular orientation imparted to the slats is positivelymaintained so long as the slats remain in the extended position. Thepositioning means precludes alteration or modification of the angularorientation in which the slat series is located when extended. To modifysuch angular orientation it is necessary to first return the slat seriesto a retracted position, then selected a different angular orientationwhile the slats are retracted, and then retraverse the slats to theextended position to produce the modied angular orientation selected.

The angular orientation desired for the slat series is preselected whilethe slat series is in the retracted position by rotating the first slatof the series about its vertical axis to the orientation desired for theslat series, and by then moving the iirst slat toward the extendedposition. The positioning means which interconnects the respective slatsof the lseries responds to the angular orientation and traverse movementimparted to the first slat to automatically and sequentially positionall successive slats of the series in the preselected angularorientation chosen. All successive slats of the series follow instep-by-step sequential fashion from the Aretracted position to theextended position in response to traverse movement o-f the first slat.In this regard, in a blind which employs a single series of slats asshown in the attached drawings, the tirst slat of the series may be the.slat which defines either the left hand margin or the right hand marginof the slat series because the slats of such a blind may be traversedeither from right to left, or left to right, in the building opening inwhich the blind is mounted.

While the blind of this invention has been designed to permit locationof its slats in only a lirnited number of predetermined angularorientations when extended, such angular orientations have been selectedto meet the most common requirements for a vertical Venetian blind. Inthis regard, in one embodiment illustrated herein one such orientationpermits the slats when extended to be fully closed so that edges ofadjacent slats partially overlap to thereby restrict passage of mostlight and all vision therebetween; another angular orientation permitsthe slats when extended to be only partially closed .so that edges ofadjacent slats are vfree of overlap so that light passage and visionthrough the slat series is only partially restricted, yet so that directsunlight and glare may be precluded. Another embodiment illustratedherein permits a third angular orientation in which the slats whenextended are fully opened .so that vision and light travel therebetweenis substantially unobstructed.

In this connection, while the embodiments of the positioning meansemployed with the blinds illustrated herein permit only twopredetermined angular orientations or three predetermined angularorientations, depending upon the construction of the positioning meanschosen, it is within the purview of this invention that slat seriespositionable in more than three predetermined angular orientations maybe provided upon modification of the positioning means disclosed hereinwithin the scope of this invention. However, in that event, the numberof angular orientations permitted will still be predetermined inaccordance with the particular construction of the positioning means ofthis invention, rather than by the use of complex slat rotatingmechanisms of the type heretofore employed which permit slat orientationin an infinite number of positions. Such slat rotating mechanisms arenot desired on included in this invention because of their complexnature and relatively high expense when compared with the simplepositioning means of this invention.

Complex and expensive slat rotating mechanisms of the type knownheretofore which permit unlimited numbers of angular slat orientationshave been found unnecessary because the limited number of predeterminedangular orientations permitted by the positioning means of thisinvention is adequate to meet all light and vision problems to whichvertical Venetian blinds normally are subjected. Also, the subjectpositioning means maintains the slats securely in the angularorientation chosen so that slat chatter and lateral sway when the slatsare extended is substantially if not completely eliminated.

Maintenance of the predetermined orientation selected for the slats isaccomplished by interconnecting linkage structures of the positioningmeans, as described hereinafter in detail, which permit traversemovement of adjacent slats toward and away from each other but whichbrace such adjacent slats against rotative movement relative to eachother when the slats are moved to the extended position. This bracingelect is produced by such interconnecting linkage structures whichcooperate with each other to define a generally rigid assembly when theseries of slats is extended, as described more fully hereinafter withrespect to the various species of the invention disclosed herein.

From the foregoing it should be understood that objects of thisinvention include the provision of an improved simple and inexpensivevertical Venetian blind; the provision of a vertical Venetian blindwhich includes means for positively positioning the slats thereof in apreselected one of a number of predetermined angular orientations whenthe slats are traversed to an extended position in a window or likebuilding opening; the provision of a vertical Venetian blind Whicheliminates complex overhead traverse cord and slat rotating mechanismsfrom its construction; the provision of a vertical Venetian blind inwhich a series of blind slats is actuated in positive stepby-step chainreaction fashion in response to manual actuation of a first slat of theseries; the provision of a vertical Venetial blind in which the angularorientation of the blind slats when in the extended position isdetermined at the time the slats series is in the retracted position inaccordance with the angular orientation imparted to the first slat ofthe series as traverse movement is initiated; and the provision of amethod of traversing slats of a Venetian blind construction whilesimultaneously locating the respective slats in a preselected one of alimited number of predetermined angular orientations.

These and other objects of this invention will become apparent to oneskilled in the art from a study of the following description, -referencebeing directed to the accompanying drawings in which several embodimentsof the invention are illustrated.

FIG. 1 is a front elevational view of a vertical Venetian blindembodying the subject invention mounted in and traversed across a windowopening to its extended position with the slats thereof in the fullyclosed orientation.

FIG. 2 is a front elevational view similar to FIG. 1 showing the slatseries in a retracted position compacted against one side frame memberportion of the casing of the window opening.

FIG. 3 is a vertical sectional view taken in the plane of line 3 3 ofFIG. 2 showing details of the supporting means employed for mounting theblind slats for traverse movement in the window opening.

FIG. 4 is a vertical sectional view taken in the plane of line 4 4 ofFIG. 3 showing further details of the slat supporting means.

FIGS. 5, 6 and 7 are generally schematic top plan views of the series ofblind slats showing various predetermined angular orientations in whichthe slats are locatable when in the extended position.

FIG. 8 is a horizontal sectional view taken in the plane of line 8 8 ofFIG. 2 illustrating details of a rst embodiment of the blindconstruction shown in the retracted position.

FIG. 9 is a vertical sectional view taken in the plane of line 9 9 ofFIG. 8 illustrating details of the positioning means employed in thefirst embodiment.

FIG. 10 is a horizontal sectional view taken in the plane of line 1(1 10of FIG. 1 showing details of the first embodiment when the same is inthe extended position with the slats thereof in the fully closedorientation.

FIG. 11 is a horizontal sectional view corresponding generally to FIG.10 but showing the slats of the blind in the partially closedorientation.

FIG. l2 is a front elevational view of the first embodiment showing theslats in the partially closed orientation of FIG. 11.

FIG. 13 is a horizontal sectional view of a second embodiment of theblind construction showing the same in the retracted position.

FIG. 14 is a vertical sectional view of the second embodiment taken inthe plane of line 14 14 of FIG. 13.

FIG. l5 is a horizontal sectional view of the second embodiment showingthe same in the fully extended position with the slats in a fully openedorientation.

FIG. 16 is a vertical sectional view of the second embodiment taken inthe plane of line 16 16 of FIG. 15.

FIGS. 17 and 18 are horizontal sectional and cut-away elevational views,respectively, of the second embodiment showing the same in the extendedposition with the slats in a partially closed orientation.

FIG. 19 is a horizontal sectional view of the second embodiment showingthe same in the extended rposition with the slats in a fully closedorientation.

FIG. 20 is a horizontal sectional view of a third embodiment of theblind construction showing the same in the extended position with theslats thereof in the fully opened orientation.

FIG. 2l is a vertical sectional view of the third embodiment taken inthe plane of line 21 21 of FIG. 20.

FIG. 22 is a plan view of a portion of the slat positioning meansemployed in the third embodiment.

FIG. 23 is a vertical sectional view through the portion of the slatpositioning means taken in the plane of line 23 23 of FIG. 22.

FIG. 24 is a Vertical sectional view corresponding generally to FIG. 2lbut showing the third embodiment in the fully retracted position.

FIG. 25 is a horizontal sectional view of t-he third embodiment showingthe same in the extended position with the slats in a partially closedorientation.

FIG. 26 is a horizontal sectional view corresponding generally to FIG.25 showing the slats of the third embodiment in a fully closedorientation.

FIG. ,27 is a horizontal sectional view of a fourth ernbodiment of theblind construction showing the same in the extended position With theslats thereof in a fully opened orientation.

FIG. 28 is a vertical sectional view of the fourth embodiment taken inthe plane of line 28 28 of FIG. 27.

FIG. 29 is a sectional view of a portion of the slat positioning meansemployed in the fourth embodiment taken in the plane of line 29 29 ofFIG. 28.

FIG. 30 is a horizontal sectional view of the fourth ernbodiment showingthe same in a retracted position.

FIG. 3l is a vertical sectional view of the fourth embodiment taken inthe plane of line 31 31 of FIG. 30.

FIG. 32 is a horizontal sectional view of the fourth embodiment showingthe same in the extended position with the slats thereof in a partiallyclosed orientation.

FIG. 33 is a horizontal sectional view corresponding generally to FIG.32 but showing the slats in a fully closed orientation.

Before describing details of construction of the various embodiments ofthis invention illustrated in the accompanying drawings, reference isfirst directed to FIGS. 5, 6 and 7. The series of slats 1 of the subjectVenetian blind construction are designed to be actuated manually duringtraverse movement by grasping and moving the first slats 1 of the seriesfrom the retracted position shown in FIG. 2 to the extended positionshown in FIG. 1, and vice versa. As will be described hereinafter, theangular orientation desired for the respective slats of the series whenextended is determined at the time the slats are in the retractedposition in accordance with the angular orientation imparted to thefirst slat 1 when traverse movement is initiated. Only a predeterminednumber of orientations is permitted in accordance with the constructionof the positioning means employed with a given series of slats.

The positioning means actuates and locates the respective slats insuccessive step-by-step chain reaction fashion in direct accord with theangular orientation preselected and imparted to the first slat of theseries when in the retracted position and in response to movement of thefirst slat to the extended position. Thus, if it is desired to have theslats oriented in the fully closed position when extended (that is, withthe planes of the slats extending generally parallel to the transversewindow axis along which the slat series is movable during traversemovement, see FIG. 5) the longitudinal edge of the first slat indicatedby the arrow in FIG. 5 is grasped and pulled. This orients such firstslat in the fully closed orientation and all successive slats areautomatically oriented in a corresponding orientation by the slatpositioning means as seen in FIG. 5 when the first slat is traversed.

If it is desired to orient the slats in a pa-rtially closed position(that is, with the planes of the slats extending at a predeterminedangle, such as 45, relative to the transverse window axis along whichthe slats are traversable, see FIG. 7), the opposite longitudinal edgeof the first slat indicated by the arrow in FIG. 7 is grasped andpulled. This orients the first slat in the partially closed orientationwhich results in the positioning means automatically locating each ofthe successive slats in a corresponding orientation.

In those embodiments of -blind construction which permit a fully openedslat orientation (that is, with the planes of the slats extendinggenerally normal to the transverse window axis, see FIG. 6), the firstslat of the series when traversed is maintained generally in the sameorientation in which the slats are located when in the retractedposition. That is, as seen in FIGS. 5, 6, and 7, when the slats areretracted their planes extend generally normal to the plane of thetransverse window axis. By maintaining that orientation in the firstslat when the same is traversed, as seen in FIG. 7 each succeeding slatfollows in similar orientation and is retained therein by the slatpositioning means.

Thus, it should be understood that if the user of the blind constructiondesires to completely close off a window opening, he grasps and pullsone edge of the first slat of the series to the extended position; if hedesires to only partially lclose ofi a wind-ow opening, he grasps andpulls the other edge of the first slat; if he desires to locate theblind in the extended position without closing ofi` the window openingto any appreciable degree, he grasps the first slat and retains itsorientation when retracted during traverse movement thereof to theextended position.

It is an important feature of this invention that when the slat seriesis located in a given preselected angular orientation when extended,such preselected orientation is positively maintained by the slatpositioning means so long as the slat series remains in the extendedposition. That is, the positioning means, which may take various andvaried forms as disclosed hereinafter, includes a series ofinterconnecting linkage structures which are interposed between adjacentpairs of slats of the blind and operatively interconnect the same. Suchstructures are designed to permit relatively free movement of adjacentslats toward and away from each other in a traverse direction ofmovement. However, such structures are designed to positively precluderelative rotation between adjacent slats when such slats are moved tothe extended position. Such rotation prevention is accomplished by thelinkage structures cooperating with the respective slats between whichthey are interposed to provide a generally rigid brace which effectivelylocks together such adjacent slats. Rotation prevention is furtherenhanced because all slats of the series are similarly braced againstrotation when the slat is extended, thereby to cooperate With each otherin defining a generally rigid interconnected assembly. To modify theangular' orientation of the slat series of the subject blindconstruction when extended it is first necessary to return the slatseries to a retracted position, then to reorient the first slats of aseries in a different desired orientation, and then again traverse theslat series to the extended position. The slat positioning means alsominimizes or eliminates slat chatter and lateral sway when the slatseries is subjected to air currents when in the extended position. Theexact manner in which the positioning means performs its intended slatorienting and bracing functions is described with respect to, and willbecome evident from a study of, each of the detailed disclosures of therespective species of this invention discussed hereinafter.

Reference is now directed to FiGS. 3 and 4, taken in conjunction withFIGS. 1 and 2, which illustrate one embodiment of means which may beemployed for supporting the blind for traverse movement in a buildingopening, such as a window opening 2 defined by a rectangular windowcasing 3 of any conventional construction. EX- tending across the topframe member of the window casing as seen in FIG. 3 is a decorativevalance 4 between the opposite side rails 6 of which is mounted asupporting track 7 which extends the full transverse distance across thewindow opening. Screws 8 located at spaced positions along the length ofthe track secure the track firmly in place. The longitudinal axis oftrack 7 defines the transverse axis of the window opening along whichthe respective slats of the blind construction are moved when traversed.It is this transverse axis which provides a plane of reference to whichthe angular orientation of the respective slats is related when theslats are in the extended position as mentioned previously.

Each slat of the series is supported in the track 7 by a supportingslide or roller member 9 movably received in the track. Depending fromeach supporting member 9 is a pivot pin 11 which secures an angledmounting bracket 12 to the supporting member. Each mounting bracket 12in turn is secured by a suitable connecting pin 13 to an associated slatvia an opening in the slat provided in line with the slat axis closelyadjacent the top thereof. Thus, each slat of the blind series issecurely supported for traverse m-ovement in response to actuation ofthe first slat of the series yet each such slat may pivot about its axison its associated pivot pin 11 to the preselected angular orientationchosen therefor in accordance with the manner of movement of the firstslat of the series. The various components of the slat supporting meansjust described may be formed from suitable plastics or metals commonlyemployed in Venetian blind constructions.

Because Venetian blind slats commonly are made from relatively thin andgenerally fiexible material, such as sheet metal or plastic, preferablythe first slat 1 of the series is provided with means to facilitategrasping thereof during traverse movement. Such grasping means in theillustrated embodiment comprises an elongated handle structure,generally designated 16, extending along each longitudinal edge of thefirst slat, preferably for the full length thereof as best seen in FIGS.1 and 5-7.

Each handle structure 16 straddles its associated longitudinal slat edgeand is secured along such edge by a series of headed pins 17 whichextend through the opposing portions of the handle and through theassociated slat adjacent its edge. The material from which the handlesare formed preferably is of the same metal or plastic material fromwhich the slats are formed so that the handles blend in with the slatseries and are generally harmonious with the overall appearance of theblind. The handles, in addition to providing means to facilitategrasping of the first slat of the series, strengthen and reinforce thefirst slat and impart additional rigidity thereto to resist stressesapplied thereto during traverse movement of the blind.

As seen in FIG. 1, the first 1 at each of the opposite ends of the slatseries is provided with graspable handles 16 because the slat seriesshown in such figure may be traversed from right to left, or from leftto right, as may be desired. In this regard, although not necessary,releasable means (not shown) may be provided in conjunction with each ofthe opposite side frame members 3 of window casing 3 to maintain anadjacent first slat of the series attached to such side frame memberwhen the blind is traversed with its opposing first slat leading.

The graspable handle structures 16 have been illustrated in the drawingsonly in conjunction with a first embodiment of the blind shown in FIGS.8-12. It should be understood, however, that similar constructionspreferably are employed in conjunction with the other embodimentsillustrated also.

In the blind embodiments to be described, only several adjacent slatsand portions of the positioning means cooperating therewith have beenillustrated for purposes of clarity. But it should be understood thatthe positioning means employed with each blind embodiment is locatedbetween and interconnects each adjacent pair of slats of the entireseries. Similarly, in FIG. 1, positioning means been been illustrated intwo runs adjacent the upper and lower ends of the slats. Depending uponthe size of the blind only one run adjacent the lower ends of the slatsmay sufice, or more than two runs of positioning means may be required.

Reference is now directed to the first blind embodiment shown in FIGS.8-12. The positioning means which interconnects adjacent slats of thisembodiment and which insures and maintains location of the respectiveslats in a preselected angular orientation in response to traversemovement of the first slat of the series comprises a series of linkstructures which are mounted between the respective adjacent slats ofthe series. Each link structure includes a movable linkage which isconnected by mounting structure with the respective slats of anassociated pair of slats between which such linkage is positioned.

The linkage comprises, as seen in FIGS. 9, 11 and 12, a pair of scissorslinks 21 and 22 respectively. These links are overlapped adjacent one oftheir ends and are pivotally interconnected with each other by means ofa headed pin 23 which projects from link 21 through an opening providedin link 22. To limit the angle at which the links may extend relative toeach other when the slat series is in the fully extended position, stopmeans in the form of a projecting shoulder 24 is provided on link 22.Shoulder 24 engages a marginal edge of link 21 (as seen in FIGS. l0, l1and 12) when the slats are in either of their predetermined angularorientations when in the fully extended position. It should beunderstood that stop shoulder 24 does not interfere with pivotalmovement of link 22 relative to link 21 in either the clockwise orcounterclockwise direction from the position, seen in FIG. 9 so that theslats may be readily positioned in either of the extended positionsshown in FIG. or 1l. It is stop shoulder 24 which limits the distanceadjacent slats of the series may be spaced from each other in accordancewith the predetermined dimensions of the slats of thc series. As it isseen in FIGS. l0 and 11, when links 21 and 22 are extended when theslats between which they are positioned are extended, such linkscooperate with each other to define, in effect, a single rigid link orbrace.

It should be noted that the links 21 and 22 are mounted between adjacentslats in inverted V fashion. Thus the weight of the links assists inmaintaining the slats spaced from each other in the angular orientationselected. This link mounting arrangement thereby resists unintentionalmovement of individual slats toward the retracted position.

At their lower ends, each of the links 21 and 22 is movably connectedwith an associated slat by mounting struc-y ture provided for thatpurpose. In the embodiment illustrated, such mounting structurecomprises slotted tabs 26 and 27 struck directly from the slats inspaced vertical relationship as best seen in FIGS. 1l and 12. All slatsexcept the first slat of the series include two such tabs providedgenerally along the longitudinal axes thereof which project in oppositedirections therefrom. The first slat of the series requires only onesuch tab.

Tabs 26 all are struck to extend in one direction from the slats, whiletabs 27 all are struck to extend in an opposite direction therefrom. Thelinkage defined by links 21 and 22 extends between each adjacentvertically aligned pair of tabs 26 and 27 of adjacent slats. As seen inFIG. 12, tabs 26 and 27 of each slat are vertically staggered relativeto each other so that the linkages between adjacent pairs of slats maybe aligned with each other when the slats are in the retracted positionshown in FIG. 8. In this regard, each pair of tabs 26 and 27 cooperateto receive a linkage therebetween in compact relationship so that theslat series when retracted may form an extremely compact pack as seen inFIG. 2.

Each of links 21 and 22 is secured to its associated tab by means of aheaded pivot pin 28 which extends through an aperture provided in theend of the link and through an elongated slot 29 provided in theassociated tab. The links and connecting pins employed therewith may beformed from any suitable material, such as a rigid sturdy plastic or arelatively light weight metal such as aluminum.

Tabs 26 and 27 as seen in FIGS. 10 and 1l extend from their associatedslats at a predetermined angle relative to the plane thereof. Such tabsthereby define angular guide members which cooperate with an associatedlinkage in positively establishing the angular relationship between suchlinkage when extended and each pair of slats interconnected thereby. Itis the angle at which the tabs project which determines the angularorientation of the respective slats relative to the transverse axis ofthe window opening when the slats are extended to the partially closedorientation shown in FIG. 11. In such orientation, the slats extendgenerally at a 45 angle relative to the transverse axis of the windowopening because the tabs extend generally at a 45 angle relative to theplane of their associated slat.

When the slats are in the fully closed orientation of FIG. 10, it willbe noted that the linkage between adjacent slats lies generally parallelto the plane of the slats, thereby permitting the edges of adjacentslats to overlap lto provide the fully closed orientation desired. Suchoverlapping is permitted by the fact that the ends of the slots 29 inwhich the heads of pins 28 are slidable terminate generally in the planeof the respective slats. Thus the slats in the fully closed orientationshown lie generally parallel to the plane of the transverse axis of thewindow opening.

In this regard, it should be noted that the linkage interconnecting eachpair of slats lies generally in line with the transverse window axiswhen the slats are fully extended as shown in FIGS. 10 and 11. Therespective linkages and tabs restrict movement of the slats from theextended orientation shown because of the interconnection of adjacentslats with each other by such linkages. Thus to change the angularorientation, it is first necessary to return the slats to a retractedposition as previously mentioned.

Rotation of the individual slats while the slat series is in either ofthe predetermined angular orientations shown in FIGS. 10 and ll isprevented by cooperation of the linkages between adjacent slats. Asnoted previously, when the linkages are in the extended position theydefine a series of generally rigid braces all of which lie generally inline with each other, as seen in FIG. 11. Thus, rotation of anindividual slat is positively resisted by the slats on opposite sidesthereof which are operatively interconnected therewith.

Relative rotation is resisted even between two slats by the engagementof the links with the outer surfaces of the respective tabs 26 and 27(FIG. 1l) or with the surfaces of the slats themselves (FIG. l). Evenwhen a given slat is collapsed, by traverse movement, against itsneighboring slat, rotation is still resisted until all slats arecollapsed together, at which time the series of slats may be rotated, atleast to some extent, generally in unison as a group. By manufacturingthe components of the respective linkage structures to close tolerances,even slight relative rotation between adjacent slats when the slats arein the extended position may be obviated.

It should be understood that the angle at which the slats extendrelative to the transverse window axis when in the partially closedorientation (FIGS. 1l and 12) may vary depending upon the angle impartedto the tabs with respect to the planes of the slats. That is, if it isdesired that the slats when fully extended and located in the partiallyclosed orientation should have an angular orientation different from the45 orientation shown in the drawings, the tabs 26 and 27 need only beformed when the blind is manufactured to extend at some other acuteangle desired relative to the plane of their respective slats.

Considering the first blind embodiment shown in FIGS. 8-12 inconjunction with the schematic showings of FIGS. and 7, it should beunderstood that location of the slats in the extended partially closedorientation shown in FIGS. l1 and 12, in which adjacent edges ofadjacent slats are spaced from each other, may be obtained merely bygrasping and `pulling on one longitudinal edge of the first slat 1 inthedirection of the arrow seen in FIG. 7. This action automatically rotatesthe first slat about its axis toward the orientation desired. Suchrotation of the first slat initiates rotation of all other slats of theseries because all slats when in the retracted position are groupedtogether in a compact pack, as seen in FIG. 8. Thus, when traversemovement of the tirst slat ofthe series is initiated, the remainingslats ofthe series have already been rotated, at least to some extent,toward the orientation selected therefor. It is this initial partialrotation of the slats toward the desired orientation which initiates andinsures the chain reaction of the linkage structures on the respectiveslats of the series. Because the linkages permit the slats to be locatedin only a generally parallel relationship relative to each other, properorientation is insured by the linkages in step-by-step fashion as eachsuccessive slat is moved toward its extended position. That is, upon,traverse movement of the first slat, the successive slats are traversedand fully rotated automatically by the linkages and mounting tabs insuccession to sequentially locate each slat in the orientationpredetermined by the angle of projection of the tabs. In this regard, itshould be noted that the pins 28 which pivotally connect each link witha tab have traveled to the outer ends of the slots 29 in the respectivetabs so that the links lie flush against the outer guide surfaces oftheir associated tabs. See FIGS. 11 and 12.

If it is desired to position the slats in the fully closed angularorientation shown in FIG. 10, it is merely necesnecessary to `grasp andpull the opposite longitudinal edge of the first Slat l. of the seriesin the direction of the arrow seen in FIG. 5. This action automaticallyproduces at least partial rotation of all slats toward the fully closedorientation desired so that subsequent traverse movement of the firstslat produces a chain reaction similar to but generally opposite fromthat described previously with respect to FIGS. 1l and 12. In thisregard, as the iirst Slat is rotated in the opposite direction about itsvertical axis, it thereby causes rotation of the successive slats, whichrotation draws the links of successive slats away from their associatedmounting tabs. This results in the pivot pins 28 traveling to the innerends of the tab slots 29 so that the links when extended may liegenerally in the same plane as the planes of the slats. Thus the slatsmay be oriented to lie generally parallel to the transverse window axisso that the edges of adjacent slats may overlap as seen in FIG. 10.

As noted previously, once the slats are positioned in either of thepreselected angular orientations described when fully extended, rotationof the slats in unison, or individually, is positively precluded becausethe linkages between all slats work together to define, in effect, anoperativeiy continuous series of braces all of which are effectivelytied together in a single operative assembly. Thus, to change theorientation of the slat series, or any individual slat, it is firstnecessary to collapse the slat series to the retracted position, inwhich position it is possible to rotate the slats as a group, asdescribed previously by altering the orientation of the first slat ofthe series.

Because the link structures of the positioning means shown in the FIGS.8-12 embodiment of this invention permits movement in only twodirections, that embodiment of the blind construction is capable of onlythe two position angular orientation shown in FIGS. 5 and 7, namely thefully closed orientation and the partially closed orientation of about45 or some other suitable preselected angle.

The other embodiments of this invention described hereinafter employpositioning means which permits at least one additional predeterminedangular orientations when the slat series is fully extended, namely thefully opened orientation shown schematically in FIG. 6 in which eachslat extends generally normal to the transverse axis of the windowopening. This third orientation is obtainable because of modifieddetails of construction in the link structures employed in the otherembodiments.

Referring now to FIGS. 13 through 19, a second embodiment of the blindconstruction is shown in which the slats may be located in threepredetermined angular orientations when in the extended position.

Each of the series of link structures of the second embodiment includesa linkage defined by a single link 36 having a predetermined angle oflongitudinal twist imparted thereto, as perhaps best seen in FIGS. 16,17 and 19. Link 36 has a longitudinal slot 37 formed therein whichextends for the major portion of the length thereof and which iscooperable with the mounting structure which secures the link to one ofthe slats of the adjacent pair of slats between which the link ispositioned as will be described.

At one end 38 thereof link 36 is provided with mounting structuredefined by a bent margin 39 which extends through a circular aperture 41provided in an associated slat. Thus, the link is pivotally connected atone of its ends so such slat but is precluded from separation therefromby the bent margin 39 located on one side of the slat and a pair of stopshoulders 42 located on the opposite side of the slat. The bent margin39 and shoulders 42 have a reduced dimension connecting neck 43 locatedtherebetween which is located in the slat opening 4l.

Link 36 is connected with the other slat of the pair of slats betweenwhich it is positioned by other mounting structure comprising an angularguide member 44 defined by a generally L shaped body when viewed invertical section (note FIG. 14). One leg 45 of the guide member isprovided with a tab portion 46 which is received through an aperture 47in the associated slat. Tab portion 46 defines one end of a reduced neckportion 48 by means of which the tab portion is connected with the mainportion of leg 45 ofthe angular guide member. Limited hinge typemovement is permitted between the guide member and its associated slatin the manner noted by comparing FIGS. 14 and 16. The other leg 51 ofthe angular guide member has a headed mounting pin 49 projectingtherefrom into and through the slot 37 provided in link 36. Thus, link36 is slidably movable relative to the angular guide member yet isprecluded from separation therefrom by the headed pin 49.

As perhaps best seen in FIG. 17, leg 51 from which the mounting button49 projects defines an angular guide surface which extends at apredetermined angle relative to the plane of the slat to which the guidemember 44 is attached. It is this angular guide surface whichestablishes the predetermined partially closed angular orientation ofthe slat series when the slats are located in the extended position. Inthe embodiment illustrated, approximately a 45 angle is defined by theguide surface relative to its associated slat.

As with the first embodiment of this invention described previously,referring to FIGS. and 19, if it is desired to locate the slats in thefully closed orientation when the slat series is extended, one edge ofthe first slat 1' iS grasped, rotated and pulled in the direction of thearrow in FIG. 5. This initial rotation of the first slat causes partialinitial rotation of all slats of the series toward the orientationdesired. This initial change in orientation results in eachsuccessiveslat being fully rotated and traversed in sequence in accordance withcontinued rotation and traversal of the first slat with the respectivelinks 36 sliding over their respective mounting pins 49 until each pinin sequence reaches the end of its associated slot 37 as shown in FIG.19. To obtain this condition, referring to FIG. 13 wherein the slats areshown in the retracted position, the edge of slat 1 lying towards thebottom of that gure is grasped and traversed as described. As noted inFIG. 19, the longitudinal twist in each link 36 counteracts the angleimparted to the guide surface of leg 51 of the guide member so thatedges of adjacent slats may be moved into close overlapping relationshipcharacteristic of the fully closed orientation.

Referring to FIGS. 7, 14 and 16, when it is desired to locate the slatsin the partially closed orient-ation the opposite edge of the first slat1 of the series, namely the edge lying at the top of FIG. 13, is graspedand pulled. This rotates the first slat in an opposite direction fromthat described above and causes partial rotation of al1 slats of theseries so that each succeeding slat will be fully rotated and traversedin sequence in direct response to actuation of the first slat. However,in this connection, the angled guide surface of leg 51 of each angularguide member 44 positively limits the angle at which a link 36 mayextend relative to the guide member and thereby automatically positionssuch link to in turn determine the angular orientation of its associatedslats as seen in FIGS. 17 and 18.

Referring now to FIGS. 13 through 16, the connecting means of thissecond embodiment also permits the slats to be oriented in a thirdangular orientation, namely one in which the respective slats extendgenerally normal to the transverse axis of the window opening as seen inFIG. 6. Such angular orientation is obtained merely by withdrawing thefirst slat 1 of the series from the retracted position while maintainingthe orientation which such rst slat has when in the retracted position.In this regard, when the slat series is retracted, each slat thereofextends generally normal to the transverse window opening axis as seenin FIG. 13. As seen in FIG. 6, if this normal position is maintainedduring initial traverse movement of first slat 1', each succeeding slatwill be similarly oriented. The longitudinal twist imparted to each linkalso comes into play in this angular orientation in that it counteraetsthe angle of the guide surface of leg 51 of the mounting guide member 44so that the successive links may be positioned to extend generallynormal relative to the planes of its associated slats as seen in FIG.15. The longitudinal twist imparted to the link prevents binding of thelink on kthe mounting pin 49 of the angled guide member 44 which wouldresult in the absence of such twist, thereby insuring smooth traversemovement of the slats between the retracted and extended positions. Itshould be understood that the components of the positioning means areconnected with each other with sufficient looseness to permit easy andsmooth traverse movement of the slats and yet with suicient tightness topreclude unnecessary play and chatter therebetween.

A third embodiment of this invention is illustrated in FIGS. 20 through26. This embodiment also permits three predetermined angularorientations of the slats when in the extended positiomThe positioningmeans of this embodiment comprises a series of link structures each ofwhich includes a link-age defined by a single link 60 which hasoppositely directed bent shoulders 61 and 62 at opposite ends thereof asbest seen in FIG. 21. These shoulders limit the amount of longitudinalmovement of link 60 relative to the mounting structures of thepositioning means by which the link is movably connected with the pairof slats between which it is located. Each mounting structure, as seenin FIG. 22, comprises a crescent shaped angular guide member 63 having asemicircular cut out 65 therein. The guide members which secure eachlink between a pair of slats are identical in construction but areoppositely oriented on the respective slats as best seen in FIGS. 2O and25.

Each guide member 63 is formed from a generally circular single piece ofsheet metal or plastic, having a circular hole therein, which is foldedupon itself along a fold line 64 (FIG. 22) to form a two ply memberhaving a slot 66 between the plies thereof (FIG. 23) through which anassociated end of link 60 extends and in which such link end isslidable. The angular guide member is provided with a stop shoulder 67spaced inwardly from one end thereof which closes off slot 66 of theguide member along one edge thereof. Thus, as shown in dotted lines tothe left of FIG. 22, when link 60 strikes shoulder 67 further movementof the link, and a slat associated therewith, is positively restricted.However, slot 66 at the other end of the guide member is not providedwith such a stop shoulder so that the link may move fully around theslot to the dotted line position shown to the right of FIG. 22.

Each angular guide member 63 of the mounting means is provided with apair of opposed notches 68 adjacent fold line 64 which define reduceddimensioned neck portions, which provide shoulders 69, received throughappropriately spaced openings 71 in a slat as perhaps best seen in FIG.25.

Referring now to FIG. 24, when the slat series is in the retractedposition, each link 60 moves within each of its associated angular guidemembers 63 to the retracted position shown, namely the dotted lineposition shown in the middle of FIG. 22. However, when it is desired toposition the slats in the fully open orientation in the extendedposition, it is merely necessary to maintain the first slat 1 of theseries normal to the transverse axis of the window opening in which theslat series is mounted so that each link 60 slides within its associatedangular guide members 63 until the respective stop shoulders 61 and 62engage the inner periphery of the cut out 65 of the guide members, asshown in the solid line position in FIG. 22. Preferably the opposingplies of the mounting guide members exert sufficient frictional force onthe links 60, without interfering with smooth blind traverse motion, sothat the links are maintained in the position selected therefor.

When it is desired to locate the slat series in the fully closedorientation shown in FIG. 26 it is merely necessary to grasp thelongitudinal edge of the first slat of the series indicated by the arrowof FIG. 5 and to move such first slat to the fully extended position.Succeeding slats will rotate and follow in chain reaction fashion asdescribed with respect to the previously described embodiments. Becausethe stop shoulders 67 provided on the respective guide members 63 do notcome in contact with the links 60 when the first slat of the series isthus withdrawn, the slats may assume the fully closed orientation shownin FIG. 26.

If it is desired to locate the slats in the partially closed orientationas shown in FIG. 25, the opposite longitudinal edge of the first slat ofthe series is grasped and pulled, as shown schematically in FIG. 7. Theother slats rot-ate and follow in chain reaction fashion until theorientation of FIG. is achieved. In this regard, when the first slat ofa series is thus actuated, the respective links 60 contact theassociated stop shoulders 67 provided on the respective angular guidemembers 63 associated therewit-h to positively limit the degree ofrotation of successive slats about their vertical axes and to therebyautomatically position all the slats in the predetermined partiallyclosed angular orientation shown in FIG. 25. Depending upon the locationof the stop shoulder 67, any predetermined angular orientation desiredmay be obtained. In the embodiment illustrated herein, an orientation ofapproximately 45 relative to the transverse window axis is obtained, asseen in FIG. 25.

A fourth embodiment of the invention is shown in FIGS. 27 through 33.This embodiment is also a three orientation embodiment as seen fromFIGS. 27, 32 and 33 respectively. The positioning means of thisembodiment comprises a linkage which includes `a single link 7dinterposed between each pair of adjacent slats and secured therebetweenby mounting structures. Each link 76 at a lower end thereof is securedto a slat by means of a headed pivot pin 77 extending through a slatopening 78. A short slot 79 is provided adjacent the link lower endthrough which pin 77 also extends. The short slot 79 permits relativepivotal and limited longitudinal movement between link 76 and the pin78.

At its upper end link 76 is secured to the other slat of the pair ofslats between which it is interposed by mounting structure defined by anangular guide member 8l, which in the embodiment illustrated comprises aone piece plastic Ibutton having disposed centrally thereof a headedprojecting pin 82 which extends through an aperture 33 provided thereforin the slat. Preferably the aperture 83 is polygonal in cross sectionand the pin 82 is correspondingly contoured with a polygonal neck topreclude rotation of the button relative to the slat.

The angular guide member 3l has another headed pin 84 (FIG. 28)projecting therefrom in an opposite direction in line with the pin 82just mentioned. Pin 84 is received through an elongated slot 86 adjacentthe upper end of link 76. Thus, substantial relative longitudinalmovement is permitted between the link and its latter mentionedassociated slat, limited only by the longitudinal extend of the slot 86.

It should be noted that at each of its lower and upper ends, 87 and 88respectively, link 76 is provided with a curved portion which extends atapproximately a 45 angle relative to the plane of the intermediateportion of the link. Similarly the angular guide member 81 is providedwith an angled guide surface 89 which extends generally at 45 relativeto the plane of the slat associated therewith (FIG. 27).

When the slat series is traversed from the retracted position shown inFIGS. and 3l to the extended position in which the slats are in thepredetermined partially closed orientation shown in FIG. 32, the angledupper end 83 of link 76 is compatibly engaged with the angled guidesurface S9 and the adjacent portion of guide member 8l to thereby locatethe link in the preselected orientation determined by the angle of guidesurface S9 relative to the plane of its associated slat. Thisorientation of each link automatically Orients each slat connected withthe lower end of such link. As seen in FIG, 29, `along one longitudinaledge of the link an upturned lip 90 is formed which permits link 76 toride over the guide surface 89 of the guide member 81 without bindingthereon.

When the slat series of this fourth embodiment is oriented in the fullyclosed orientation, as shown in FIG. 33, it will be noted that the bentportion at the link upper end 3S is generally free of engagement withthe angular guide surface 89 of the guide member 81 so that therespective slats may be located in the fully closed overlappingorientation shown.

Finally, if it is desired to locate the respective slats in the fullyopened orientation, as with embodiments earlier described, it is merelynecessary to maintain the first slat of the series generally normal tothe transverse axis of the Window opening as the slats are withdrawn.This results in the mounting pins 78 and 84 riding in their associatedslots 79 and S6 provided at opposite ends of each link to permitmovement of the slats to the fully opened orientation shown in FIGS. 27and 28. In this regard, the upper end 88 of each slat, as perhaps bestseen in FIG. 28, is also provided with a right angled bent marginalshoulder 92 which engages with the upper edge of the angular guidemember Si to positively limit longitudinal movement between each linkand the pin 84 of its associated angular guide member when the slats aremoved to the fully opened orientation as seen in FIG. 28.

From the foregoing four embodiments illustrated and described, it shouldbecome apparent that modifications in the construction of thepositioning means employed with a vertical Venetian blind embodying thisinvention may be devised. However, all such positioning means chosenshould be capable of producing the same novel traverse functiondescribed herein, and of operating in the same novel traverse methoddisclosed herein, to automatically locate all slats of a series in apredetermined angular orientation, which is selected while the slats arein the retracted position and which is determined in accordance with theangular orientation imparted to the first slat of the series whentraverse movement thereof is initiated. It should `be understood thatthe positioning means chosen should -he capable of performing theimportant function of restricting alteration of the angular orientationof the slat series solong as the slat series is retained in the extendedposition. rThis important function is accomplished by the respectiveslat structures of the positioning means cooperating with each other topreclude pivotal movement of individual slats except in sequence Whilethe slats are moving between the retracted and extended positions.

Having thus made a full disclosure of this invention and severalembodiments of the construction in which it may be formed, reference isdirected to the appended claims for the scope to be afforded thereto.

I claim:

1. A method of traversing a series of slats of a traverse type VerticalVenetian `blind while simultaneously orienting said slats in sequence ina preselected one of a limited number of angular orientations relativeto a reference plane, comprising the steps of providing positioningmeans which interconnect said slats and permit orientation thereof inonly said limited number of angular orientations when said slats aretraversed from a retracted position toward an extended position, saidpositioning means being sequentially responsive to actuation of thefirst slat of said series and to the angular orientation of said firstslat during traverse movement, locating said first slat in a preselectedorientation relative to said reference plane corresponding generally toa preselected one of said limited number of angular orientations inwhich it is desired to locate said slats when said slats are in saidextended position, actuating said first slat to move the same towardsaid extended position, and while said first slat is moved toward saidextended position sequentially and individually orienting successiveslats of said series with said positioning means so that each of saidsuccessive slats of said series fol- 15 low in sequence in acorresponding orientation in response to step-by-step actuation of saidpositioning means by said iirst slat.

2. The method of claim 1 in which one preselected orientation of saidseries of slats is obtained by locating said first slat of said serieswith one of its edges in leading relationship when said series is insaid retracted position, and then moving such slat toward said extendedposition with said one edge leading; and in which another preselectedorientation of said slats is obtained by locating said first slat withthe other of its edges in leading relationship when said series is insaid retracted position, and then moving such slat toward said extendedposition with said other edge leading.

3. The method of claim 2 in which a third preselected orientation ofsaid series of slats is obtained by locating said first slat of saidseries with neither of its edges leading when said series is in saidretracted position, and then moving said first slat toward said extendedposition while maintaining such relationshippbetween said edges thereof.

4. A method of traversing a series of operatively interconnected slatsof a traverse type vertical Venetian blind to orient each of said slatsin a preselected angular orientation relative to a reference plane alongwhich said slats are traversable, comprising the steps of mounting saidseries of slats for traverse movement generally along said referenceplane; locating the rst slat of said series in an angular orientationrelative to said reference plane which corresponds generally to saidpreselected orientation in which it is desired to locate said slats whensaid slats are in said extended position; when said first slat is thusoriented, actuating the same to move it toward said extended position;during such movement of said first slat, placing a restriction on thesecond slat of said series to preclude orientation thereof in an angularposition relative to said reference plane which is substantiallydifferent from said preselected orientation; While said restriction isthus placed on said second slat, continuing movement of said first slattoward said extended position to thereby draw said second slattherewith; and sequentially placing a similar angular restriction oneach successive slat of said series While continuing movement of saidfirst slat, whereby all slats of said series may be located sequentiallyin said preselected 16 orientation in response to traverse movement ofsaid first slat.

5. A method of traversing a series of operatively interconnected slatsof a vertical Venetian bind to orient all said slats in a correspondingpreselected angular orientation relative to a reference plane alongwhich said slats are traversable, comprising the steps of mounting saidseries of slats for rotation about their respective vertical axes andfor traverse movement generally along said reference plane; rotating thefirst slat of said series about its vertical axis to locate the same inan angular orientation relative to said reference plane whichcorresponds generally to said preselected orientation in which it isdesired to locate said slats when said slats are in said extendedposition; when said first slat is thus oriented, moving the same towardsaid extended position; during such movement of said first Slat, placinga restriction on the second slat of said series which precludesorientation thereof in an angular position which is substantiallydifferent from said preselected orientation but which permits rotationthereof to said preselected orientation during traverse movementthereof; while said restriction is maintained on said second slat,continuing movement of said first slat toward said extended position tothereby rotate said second slat about its vertical axis fully into saidpreselected orientation in accordance with the restriction placedthereon while the same moves toward said extended position; andsequentially placing a similar angular restriction upon each successiveslat of said series while continuing movement of said first slat,whereby all slats of said series are rotated sequentially into saidpreselected orientation while the same are moved sequentially towardsaid extended position in response to traverse movement of said firstslat.

References Cited UNITED STATES PATENTS 1,858,801 5/1932 Bolard 160-1662,776,708 1/1957 Long 160-169 3,156,295 11/1964 Vecchiarelli et al.160-175 DAVID I. WILLIAMOWSKY, Primary Examiner.

HARRISON R. MOSELEY, Examner.

P. M. CAUN, Assistant Examiner.

1. A METHOD OF TRAVERSING A SERIES OF SLATS OF A TRAVERSE TYPE VERTICALVENETIAN BLIND WHILE SIMULTANEOUSLY ORIENTING SAID SLATS IN SEQUENCE INA PRESELECTED ONE OF A LIMITED NUMBER OF ANGULAR ORIENTATIONS RELATIVETO A REFERENCE PLANE, COMPRISING THE STEPS OF PROVIDING POSITIONINGMEANS WHICH INTERCONNECT SAID SLATS AND PERMIT ORIENTATION THEREOF INONLY SAID LIMITED NUMBER OF ANGULAR ORIENTATIONS WHEN SAID SLATS ARETRAVERSED FROM A RETRACTED POSITION TOWARD AN EXTENDED POSITION, SAIDPOSITIONING MEANS BEING SEQUENTIALLY RESPONSIVE TO ACTUATION OF THEFIRST SLAT OF SAID SERIES AND TO THE ANGULAR ORIENTATION OF SAID FIRSTSLAT DURING TRAVERSE MOVEMENT, LOCATING SAID FIRST SLAT IN A PRESELECTEDORIENTATION RELATIVE TO SAID REFERENCE PLANE CORRESPONDING GENERALLY TOA PRESELECTED ONE OF SAID LIMITED NUMBER OF ANGULAR ORIENTATIONS INWHICH IT IS DESIRED TO LOCATE SAID SLATS WHEN SAID SLATS ARE IN SAIDEXTENDED POSITION, ACTUATING SAID FIRST SLAT TO MOVE THE SAME TOWARDSAID EXTENDED POSITION, AND WHILE SAID FIRST SLAT IS MOVED TOWARD SAIDEXTENDED POSITION SEQUENTIALLY AND INDIVIDUALLY ORIENTING SUCCESSIVESLATS OF SAID SERIES WITH SAID POSITIONING MEANS SO THAT EACH OF SAIDSUCCESSIVE SLATS OF SAID SERIES FOLLOW IN SEQUENCE IN A CORRESPONDINGORIENTATION IN RESPONSE TO STEP-BY-STEP ACTUATION OF SAID POSITIONINGMEANS BY SAID FIRST SLAT.